Method of and apparatus for manufacturing nail hammers having integral shanks



May 15, 1928. 1,669,701

E. O. ESTWIN I METHOD OF AND APPARATUS FOR MA "ACTU G NAIL HAMMERS HAVING EGRA SHANKS I F d Feb. 5,. .1926 3 Sheets-Shoot 1 Jim 6101)..

May 15, 1928. 1,669,701

E. o. ESTWlNG METHOD OF AND APPARATUS FOR MANUFACTURING NAIL HAMMERS HAVING INTEGRAL SHANKS Filed Feb. 5. 192,6 3 Sheets-Sheet 2 illie-1215f: Emmi Efiiiflv'flg,

G NAIL nAmwas HAVING May 15, 1928.

s 26 3 Sheets-Shut 3 E. O. ESTWING METHOD OF AND APPARATUS FOR MANUFACTURIN INTE L SH Flled b.5

ANK l9 lwaul6fi v 137265: r, a] A j Patented May 15, 1928.

ouvre!) STATES 1,669,701 ,rnreur OFFICE.

ERNEST '0. ESTWING, OF ROCKFORD, ILLINOiS, ASSIGNOB TO .ESTW ING ,MAND'FAC- roams mm; me, or noon-om),

METHOD OF AND AEPPAMTUS ILLINoIsn CORPORATION or ILLINOIS.

FOR MANUFACTURING NAIL "HAMMEBS HAVING INTEGRAL .SHANKS.

a nmmnmea February 19:6. zserm m. 56,201.

:The term nail hammer is hereinused to .denotea hammer havinga head :providedat one end with :a striking surface andat the other end witha split claw close to the handl'eto provide-the proper leverage .for. pullnails. It is common practice to forge hammer-heads which are adapted for mounting upon wooden handles, :bnt ithas :not heretofore been possibleto forge .a nail hammer having a head which .is integral with a shank constituting the handle. The object .or the present invention, therefore, is to provide a'method of and an apparatus .i'or .iorging anail hammer having :a head which 1-5 isintegral with the handle shank.

In the -.ac.cornpanying drawings, 'Figure 1 is a :Era-gmental view of a bar constituting the stock from which hammers may be forged. a p v g Fig. 12 is .a view of aportion of -.said.har roughl .iorged into Lconditionnto be placed ibetween :torging idies. 1

Fig. 3 is .an zend view ofthetorging shown in.Fi.g..2. f Fig. 4 is .a-side' view of the forging prodjuced'by the action .of the firstsetof targingdies.

.5 is an edge View ofisaidportion.

:Fi-g. 6-.is .aleft hand end :viewof'the forg '80 ing- Fig. "7 vis aseetionon line f7.- 7 of Fig. 4. Fig- .8 representsthe forging shown in Fig. 4 after thefin has beentrimmed off.

Fig. .19 isa fragmental view of the hammer:aifiterthe head :thereofhas beenwsubjected to the action of a die :adapted to split the .claw. r

Fig. 10 isa view looking'from -the right hand .side of Fig. 9. X

Fig. 11 illustrates the next step inthe operation of forming the claw.

12' is a view looking from the right I [forging shown in Fig. 8. As indicated in hand side :of Fig.v11.

Fig. 18 illustrates the next step in the opg5 eration :of forming the claw.

Fig. 14 is a view taken fromthe r'ight handsside of Fig. .13.- V

Fig. 15 is a sectionon line 1515 of Fig.

' 11. 50. Fig. 16 .is a section on line 1'6-16 of Fig. 13. a

:Fig. 17 is a plan view illustrating the dies .n-sed in producing the claw.

.18 is a side view of the dies shown in the lower portionof Fig. '17.

7 Figs. 19 and 20 are sectional views taken in theplanes of lines.l9--19I and 20--90, speetively of Fig. 17.

The hammers are .i'orged [from any suitable material as, for example, a round steel bar .A, the portion required in the o- .duction of one hammer being indicated at the left-hand: .sideot the dotted line in "Fig. .1. Theendwoilf the bar Ais forged between dies into the form represented in ig. 2 to produce.- a portion A destined to become the hammerhead and an elongated portion A whichis :tolbecomethe handleshank. The .portion A is -.approximately.cas long as the finished shank. i Y 1 The forging shown in Fig. "2 is forged between dies to pnoduee the nail hammer head l comprising a claw blank 1, and a handle shank 2 comprising a neck 3 adjacent to the head and the portion 4 to receive the grip (not shown). As indicated in Fig. 5, the portion '3is relatively thin when measured transversely to the plane of the head :and is suflicient'ly'wicle when measured in theplane or the head to provide the neees-' sary rigidity and strength, neck 3 being :thus especially well adapted to resist the stresses that arise in driving and pulling nails, without being so heavy as to destroy the proper balance of the tool. I The portion 4' of the handle shank may or any suitable cross-sectional form, but is preferably cruc'iiorm' in cross-section as illustrated in Fig. 7.

The surplus metal thatxitorms the flash tin 5 is trimmed oil, thus producing the forlging shown in Fig. 8,.

p he 'next operation is the grooving 'or partial splitting of the nail-pulling claw. 1n producingthe claw, the for ing is placed in the apparatus illustrated in ig. 1.7, wherein D'denotes a die adapted to receive the Fig. 19* the .die 3) comprises a surface D conforming to theshapeof the front side of thexhammer'head -Above the die D is a.

' E. "It is-mounted for movement inxtheplane of the hammer headhut in a direction which is at an'acute angle to the handle shank 2.

The impact of the die E against the middle of the rear side of the claw blankproduces a groove 6 (Figs. ,10 and 15) and spreads the two portions of the claw apart somewhat, as shown by a comparison of F lgs'. 6and l0. The groove 6 is madeas deep 7 as" practicable. V

.ground smooth and polished.

portion ofthedie F and the blade 13".. The

die G has a groove G therein to accommodate a, concaVo-convex web 6? which is formed from the bottomof the groove 6 when the claw is forced ontothe blade F" by the bending dieG. -In1the operationof the bending die G the upperend of the concavo-convex web sometimes breaks ,open to, form a wedge-shaped slot. The dieGrexerts pressure against the forward side of the claw blankin a direction at an obtuse angle to the handle shank.

All of the operations thus far described are preferably carried out in such quick succession that reheating is unnecessary. i

The next operation is the grinding away of the web .6 to produce a wedge-shaped slot 7 (Fig.v 14:) in the claw. The'hammer head and the neck 3 are then ,ready to be p It will be seen that by the method herein" disclosed, I am enabled to forge a nail ham- .mer whichv has a head integral with the handle shank, the slot in the'claw having sharp edges, as required in a highgrade nail hammer. -j J a i I claim as myinvention: a l. Themethod of forming a nail hammer having a head and a handle shank integral withthe head which comprises the'following steps, first, forging a heated piece of metal to form a portion destined to become V a hammer head and anelongated portion groove by exertlng pressure against the midwhich is to become a handle shank, second,

forging the first mentioned portionto' form .a hammer head having a claw'blank, and.

forging the second mentioned portion to form the handle shank, third, trimming off the flash surrounding said headand handle shank, fourth, forging a groove in said claw blank and simultaneously spreading the portions of said blank at opposite sides of the dle ofthe rear side of thecla'wtblank in a direction at an acute angle to the handle shank, fifth, bending the claw blank by ex, erting pressure against the forward sideof the claw blank in a direction atsan obtuse angle to the handle shank and simultanously forcingv the bottom wall of the grooveinto the "form of a con'cavo-convex' web, and, sixthfremoving said web tofo'rm a wedge-- shaped slotin the claw.

2. The method of forming a nail hammer having a head and a handle shank integral with the head-which comprises the following steps, first, forging a heated piece of metal to form a portion destined to become a'hammer head and an elongated portion whichis l to .becomea handle shank, second, forging thefirst mentioned portion to form a Iner headhaving a claw blank, and forging the secondmentioned' portion tocform :the

handle shank, third, trimming ofi'the flash surrounding-said head and handle shank,

fourth, forging a groove in saidclawblank and, .simultaneously spreading the portions of said blanks at opposite sides ofthegroove by exerting pressure against the middle of the rear side of the claw'blank, and fi fth, bending. the claw blank by exerting pressure against the forwardside of the claw blank.

3. The method of forming a .nail hammer having a head and a handle' shankintegral with the head which comprises the following steps, first, forging a heated piece of metalto form a portiondestined to become a hammer head and an elongated portion which is to become a handle shank, second, forging the first mentioned portion to form ahammer head having a claw blank, and forging, the second mentioned-portion. to

form 1 the.,-handle shank, third, trimming. off

the flash surrounding said head and handle shank, fo.urth, forging a groove in said claw blank andsimultaneouslyspreading the por- I tions of said. blank at opposite sides of the .groove by exerting pressure--'against.the middle of the. rear .side of the claw blank in a direction. at an acute angle to the handle multaneously forcing .the bottom walllof'the shank,jfifth, bending the'clawblank and sigroove into. theform .ofwaconcavo-convex web, and sixth, removing said web to form awedge-shapedslotin theiclaw. l

4. The method of forming a nailnhammer having a head and, a handle shank integral with the head. which comprisesthe followlng steps, first,q.forging,a heated. piece of metal to form a portion destinedto become a. hammer head and an elongated portion which is to become a handle 'shank,second,

forging the first mentioned portion to form a hammer head'having .a claw blank, and

forging the sccondme"ntioned portion to form the handle shank, third, trimming. off

the flash surrounding said head and handle.

shank, fourth, forging a groove in said claw blankiand simultaneously spreading the portions of said blankat opposite sides of the groove,-.fifth', bending the claw blank land simultaneously;forcing .the bottom wall of the groove into the form of a concavo-convex web, and, sixth, removing said web to form a wedge-shapedslot in the claw.

5. Apparatus for use in forming the claw of a nail hammer having a handle shank integral therewith, said apparatus comprising two dies between which the hammer head is placed, one of said dies being adapted to form a groove in the middle of the rear side of the claw blank, the last mentioned die being arranged to reciprocatein a direction which is at an acute angle to the handle shank.

6. Apparatus for use in completing the formation of the claw of a nail hammer having a handle shank integral therewith, said claw having a groove in its rear side, said apparatus comprising two dies between which the hammer head is placed, one of said dies conforming to the final shape to be imparted to the rear sideof the claw, said die comprising ablade having a rounded edge adapted to project into said groove, the other die conforming to the final shape'to be iven to the forward side of the claw and adapted to bend the claw into contact with the first die, the second die having a groove to accommodate a concavo-convex web formed from the bottom of the groove in the claw when the claw is forced onto said blade.

7. The method of forming a nail hammer having a head and a handle shank integral with the head which comprises the following operations, forging a heated piece of metal to form a portion destined to become a hammer head and an elongated portion which is to become a handle shank, forgingthe first mentioned portion to form a hammer head having a claw blank and forging the second mentioned portion to form'the handle shank, trimming ofi the flash surrounding said head and handle shank, forging a groove in said claw blank and spreading the portions of said blank at opposite sides of the groove, and bending the claw blank by exerting pressure against the forward side of the claw blank. i

In testimony whereof, I have hereunto aflixed my signature.

I ERNEST O. ESTWING. 

